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Am J Hum Genet. 2011 Dec 9;89(6):792-7. doi: 10.1016/j.ajhg.2011.11.011.

Lipoic acid synthetase deficiency causes neonatal-onset epilepsy, defective mitochondrial energy metabolism, and glycine elevation.

Author information

1
Department of Pediatrics, Paracelsus Medical University Salzburg, Salzburg 5020, Austria. h.mayr@salk.at

Abstract

Lipoic acid is an essential prosthetic group of four mitochondrial enzymes involved in the oxidative decarboxylation of pyruvate, α-ketoglutarate, and branched chain amino acids and in the glycine cleavage. Lipoic acid is synthesized stepwise within mitochondria through a process that includes lipoic acid synthetase. We identified the homozygous mutation c.746G>A (p.Arg249His) in LIAS in an individual with neonatal-onset epilepsy, muscular hypotonia, lactic acidosis, and elevated glycine concentration in plasma and urine. Investigation of the mitochondrial energy metabolism showed reduced oxidation of pyruvate and decreased pyruvate dehydrogenase complex activity. A pronounced reduction of the prosthetic group lipoamide was found in lipoylated proteins.

PMID:
22152680
PMCID:
PMC3234378
DOI:
10.1016/j.ajhg.2011.11.011
[Indexed for MEDLINE]
Free PMC Article

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